I accessed the vent covers from the roof. Used the same two sided tape, cut a 3.5 inch hole in the middle for the motor and an 8 inch cut 2 inches in for hinge. I do not plan on taking it down the highway open. Reflectix can be used to increase the R factor of existing insulation or a wall itself, as long as there is a gap between it and the wall or insulation. Its other use is obviously to reflect. I think we are getting both in our application to the skylight. We allosed for a 1 to 2 inch gap. The Reflectix is hot to the touch, but heat no longer radiates into the bathroom. Probaby relecting UV while at the same time providing insulation. Take a look at their website: http://www.reflectixinc.com/basepage.asp?PageName=DIY+Unique+Applications&Page Index=560